I have a new Tiguan. It’s supposed to be AWD. In reality though, even when in off-road mode, it’s basically front-wheel-drive as evidenced by the fronts spinning when you accelerate hard into a gap in traffic. Most cars that use a Haldex oem for their awd act similarly.
The neat thing about the Haldex is that with just a software tune you can substantially improve the performance of it. The hardware is actually far more capable than you'd ever know with the enormous amount of slack that's programmed into it from the manufacturers. Obviously this voids your warranty, but it's a fairly low-risk modification.
I only spent a few minutes on Google so you'd have to do your own research since I am not familiar with the Tiguan although I know the MQB platform it's built on. Anyway for the Tiguan you might have to actually order a part, there might not be enough interest in that model specifically. If you google "tiguan haldex tune" it will take you in the right direction. This tune is somewhat common for the performance cars on the MQB platform, like the Golf R and RS3. I can't think of any reason it would cause trouble for the Tiguan but it's mostly track junkies doing these modifications, not offroad enthusiasts.
When I put my car into sport mode, it does nearly 50/50 power application. When it’s in normal or eco, it will put 80% of the load on the front tires, then only increase rear tire load as needed.
